Finding the Fourth Proportional to 3,987.90, 5,974.89 and 2,599.02

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.90 : 5,974.89 = 2,599.02 : x
2. Step 2: Convert to fraction form
   3,987.90/5,974.89 = 2,599.02/x
3. Step 3: Cross multiply
   3,987.90x = 5,974.89 × 2,599.02
4. Step 4: Simplify right side
   3,987.90x = 15,528,858.61
5. Step 5: Solve for x
   x = 15,528,858.61/3,987.90
6. Step 6: Final answer
   x = 3,893.99